Block Reference

Single Schnorr signature verification against a committed public key. Equivalent to OP_CHECKSIG in Tapscript.

M-of-N threshold signature verification. Conditions commit to N pubkeys and threshold M.

Adaptor signature verification for atomic swaps and DLCs. Reveals a secret scalar upon completion.

MuSig2/FROST aggregate threshold signature. On-chain footprint identical to single-sig.

Signature using a key commitment from a relay block. Cross-rung key sharing without duplicating pubkeys.

Relative timelock by block count. UTXO cannot be spent until N blocks after confirmation.

Relative timelock by time (512-second granularity).

Absolute timelock by block height. Equivalent to OP_CHECKLOCKTIMEVERIFY.

Absolute timelock by Unix timestamp using median-time-past.

BIP-340 tagged hash preimage verification. Domain-separated hashing.

Non-invertible SHA-256 preimage verification.

CheckTemplateVerify (BIP-119). Verifies spending transaction matches a committed template hash.

Two-path vault with recovery key (immediate) and hot key (CSV-delayed).

Output amount range check. Prevents dust and enforces spending caps.

Enforces output recreates the identical covenant. Perpetual re-encumbrance.

Recursive covenant with allowed field mutations per iteration.

Conditional recursion with termination condition. Bounded loops with exit criteria.

Count-limited recursion. Decrements counter each spend, terminates at zero.

One input covenant fans out into multiple output covenants.

Each recursive spend reduces output value by a committed decay factor.

Generic anchor point. 32-byte anchor hash identifying an off-chain structure.

Payment channel anchor. Channel ID and sequence number.

Liquidity pool anchor. Binds UTXO to a specific pool structure.

Reserve proof anchor. Minimum reserve amount for proof of reserves.

Tamper-evident seal. Single-use commitment for client-side validation.

Oracle attestation anchor. Spending requires oracle's signed event attestation.

Typed OP_RETURN replacement. Up to 32 bytes, max one per transaction.

Fee-rate hysteresis controller with deadband.

Value-based hysteresis with high/low thresholds.

Continuous on-delay timer. Spending allowed after preset duration elapses.

Off-delay timer. Time-limited withdrawal windows.

Set-dominant latch. Irreversible state transitions.

Reset-dominant latch. Inverse of LATCH_SET.

Down counter for N-spend limits.

Preset counter with configurable target. Reset on trigger.

Up counter for tracking spend count in stateful covenants.

Numeric comparator with configurable operator (EQ, NE, LT, LE, GT, GE).

Step sequencer. Ordered multi-phase spending policies.

Single-pulse trigger. Exactly one spend, then permanently disables.

Maximum spends within a block-height window.

Co-signing gate. Additional signature from a committed co-signer key.

SIG + CSV in one block. Saves 8 bytes on wire.

Hash + timelock + signature. Replaces 3 blocks. Saves 16 bytes.

Hash preimage + signature check. Saves 8 bytes.

Adaptor point + CSV + signature. For payment channels.

SIG + CLTV in one block. Saves 8 bytes.

M-of-N + CSV for penalty branches and vault recovery.

Periodic spending windows using block height modular arithmetic.

Maximum transaction weight constraint.

Min/max bounds on input count.

Min/max bounds on output count.

Anti-siphon ratio enforcement. Output/input value ratio check.

Merkle set membership proof with sorted-pair proofs.

Per-output value and script constraint.

Pay-to-Public-Key. Delegates to EvalSigBlock.

Pay-to-Public-Key-Hash. HASH160(pubkey) + signature check.

Pay-to-Script-Hash. Inner script must be valid Ladder Script conditions.

SegWit v0 key-hash spending.

SegWit v0 script-hash with typed inner conditions.

Taproot key-path spend. Delegates to EvalSigBlock.

Taproot script-path spend. Closes the primary inscription vector.

Compact single-key signature rung. SCHEME (1B) inline, public key folded into Merkle leaf. Resolves to SIG at evaluation.